Telephone



Feb. 2 1926;

R: H. WHITE TELEPHONE Filed Sept. 21, 1923 1 T0 SOURCE OF COMPRESSED NR Tl] SOURCE OF COMPRESSED INVENTOR RICHARD H- WHITE ATTORNEY Patented Feb. 2, 1926.

UNITED STATES 1,571,356 PATENT OFFICE.

RICHARD HUBER!!! WHITE, OF LONDON, ENGLAND, ASSIGNOR TO RADIO CORPORATION OF AMERICA, A CORPORATION OF DELAWARE.

TELEPHONE.

Application filed September 21, 1923. Serial No. 663,985.

To all whom it may concern." I

Be it known that I, RIoHARn HUBERT WHITE, a subject of Great Britain, and a resident of Sunningfields Road, Hendon,

London, N. W. 4, England, have invented new and useful Improvements in Telephones, of which the following is a specification accompanied by drawings.

. The object of this invention is to provide an improved loud speaking telephone.

According to this invention modulated currents are led to the plates of a condenser composed of metal foil sheets interleaved with sheets of flexible dielectric material and the consequent movement of the plates controls the flow of compressed air. A nozzle or outlet may be arranged opposite and closeto the middle of one of the outside sheets of the condenser which is enclosed in a casing provided with means for regulating the air pressure in it. Thus the movements of the sheets vary the eiiective aperture of the nozzle. In some cases, however, I may cause the movements of the condenser instead of directly varying the effective aperture of a nozzle to actuate a valve which pontrols the flow of air from a nozzle or out- My invention is illustrated by the accompanying drawing in which Fig. 1 is a diagrammatic representatlon of an embodiment in which the movement of the condenser sheets directly controls. the

orifice of the nozzle. 7

Fig. 2 is a modification in which .the condenser plates actuate a valve which controls the flow of air from the nozzle.

Referring to the drawings A is a condenser divided into two parts A and A" each formed of a number of metal foil sheets M interleaved with sheets of flexible dielectric material such as corru gated paper or cloth. The separating memher A is electrically connected to one side of each part A and A The top and bottom sheets bear against adjusting screws B carried by levers 0, C The lever O carries a cylinder D which has apertures cut D in it and to the interior of which compressed air can be supplied through a union E. Within the cylinder works a piston F having a ertures F which bear against the lever C the pressure of the air on the piston being balanced by a spring G. The two halves .of the condenser A are connected in a kind of bridge arrangement with two other condensers H H forming a split condenser across which is connected a-polarizing battery J. Between the middle A of the condenser parts A and A and a point between the two condensers H I-I' is connected the secondary K of a telephone transformer, in the primary L of which flow the currents to be transformed into sound. The Variations of current in the secondary K cause movements of the plates ofthe condenser A and consequently movements of a casing O to which the compressed air is supplied. At one end the condenser plates are close to an orifice or opening 0 and the currents are transformed into sound by the variation of the size of the opening due to the movements of the condenser plates. An adjusting screw B permits initial adjustment of the size of the opening. In this figure a horn or trumpet P is also shown.

The instrument may also be used as a fog signal or hooter. In this case alternating current or modulated continuous wireless waves areapplied to the condenser, so that the issuing stream of air will loudly reproduce the feeble currents flowing through the secondary K.

Having described my invention what I claim is as follows I 1. A telephone in which the movements of the plates of a'condenser control the flow of compressed air, substantially as described.

2. A telephone in which the movements of the plate of a condenser actuate a valve controlling the flow of compressed air.

8. A device for producing sounds from a source of variable electric currents comprising a condenser having its plates. mounted to permit relative movement and its terminals co-operativelyconnected to said source, and a source of compressed gas connected to an aperture, said aperture and said plates being adapted to cooperate to vary the offer:-

air emission.

' tive aperture whereby sound Waves are produced by the varying gas emission.

4. A device for producing sounds 'froma source of variable electric currents comprising a condenser having its plates mounted to permit relative movement and its terminals associated with said source, a source of compressed gas connected to an aperture and means cooperating with the plates of the condensers for varying the'aperture whereby sound waves are produced by the varying 5. A device for producing sounds from a source of variable electric currents comprising a condenser having its plates mounted to permit relative movement and its termi- ,nals associated with said source, a casing having an, aperture and a source of fompressed gas connected to the casing, said condenser being adapted to vary the effective aperture whereby sound waves are produced by the varying gas emission.

6. A device for producing sounds from a source of variable electric currents comprising a condenser having its plates mounted to permit relative movement and its terminals associated with said source, a source of compressed gas connected to an aperture, means cooperating with the plates of the condenser for varying the aperture and adjusting means for controlling the initial aperture.

7. A device for producing soundsfrom a source of variable electric currents comprising a. condenser having its plates mounted to permit relative movement and its terminals associated with said source, a piston and a cylinder cooperating therewith having apertures and adapted to act as a valve and means cooperating with the plates of the condenser for controlling the relative position of the piston and cylinder.

8. A device for producing sounds from a source of variable electric currents compris ing a condenser having a yielding di-electri'c adapted to permit relative movement between the plates and having-its terminals associated with said source and a source of compressed gas connected to an aperture, said condenser being arranged to control'the effective aperture whereby sound waves are produced by the varying gHSVQIIIlSSiOII.

9. A device for producing sounds from a source of variable electric currents compris ing a condenser having a corrugated di-electric between its plates adapted to 1 permit relative movement therebetween, the terminals of-said condenser being associated with the source, and a source of compressed gas connected to an aperture, said condenser plates being adapted to control the efl'ective aperture whereby sound waves are produced by the varying gas emission. I

10. A device for producing sounds from a source of variable electric currents comprising asplit condenser having its platesmounted to permit relative movement, the

second split condenser connected thereto, the

midpoints of said split condensers being associated with opposite terminals of said source and a source of compressed gas connected to. an aperture, said condenser plates being adapted to control the effective aperture whereby sound waves are produced by the varying gas emission.

11. A device for producing sounds from a source of variable electric currents comprising a split condenser having a yielding di-electric adaptt'l to permit relative movement between the plates and the condenser, a second split condenser connected thereto, the mid-points of said split condensers being associated with opposite terminals of- 'Sflld source and a. source of compressed gas connected to an aperture, said condenser plates being adapted to control the effective aperture whereby sound waves are produced by the varying gas emission.

12. A device for producing sounds from a source of variable electric currents comprising a split condenser having its plates mounted to permit relative movement, a

second split condenser connected thereto, the mid-points of said split condensers being associated with opposite terminals of said source, a polarizing source of direct current connected across said split condensers and a source of compressed gas connected to an aperture, said condenser plates being adapted to control the eflective aperture whereby sound waves are produced by the i a source of variable electric currents comprising a condenser having its plates mounted to permit relative movement and its ten minals associated with said source. a piston and a cylinder having oo-operating apertures and connected to a source of. compressed gas and a lever actuated by the movement of the said condenser plates adapted to control the relative position of said cylinder and piston whereby the efl'ected aperture may be varied andsounds pro:

duced by the varying gas emission.

15. A device for producing sounds from a source of variable electric currents compris ng a condenser having its plates mount ed to permit relative movement and its terminals connected to said source, a piston and cylinder adapted to control an aperture, a lever actuated by the movement of said plates and adapted to control the relative position of the piston and cylinder, a source of compressed gas connected to the piston and cylinder and balancing means for neutralizing a normal pressure of the compressed gas.

16. A device for producing sounds from a source of variable electric currents comprising acondenser having its plates mounted to permit relative movement and having its terminals associated with said source, a piston and a cylinder adapted to act as a valve to control an aperture, a source of compressed gas connected to said piston and cylinder, a pivoted lever associated at one side of the pivot with said condenser plates and at the other side with said valve and a spring for neutralizing the normal pressure of the compressed gas.

17. A device for producing sounds from a source of variable electric currents compris ing'a casing having an aperture, a condenser therein having its plates mounted to permit relative movement and its terminals associated with said source, said condenser plates being adapted to control the efiected aperture and a source of compressed gas connected said casing.

RICHARD HUBERT wHrrE. 

